Nickel tetraphosphine complexes

Efficient electrocatalysis can be exemplified by dehalogenation of ai and alkyl halides (ArX). The direct electrochemical r uction of these compounds requires very low redox potentials (-1.6 V). However, in the presoice of the zero-valence nickel tetraphosphine complex, efficirat ddialogenation via the scheme... 

Stereoisomeric mixture of nickel complexes of 16-membered macrocycle 32 was obtained using both templating and high-dilution procedures. The isomers of macrocycle 33 were liberated from nickel by cyanide (Scheme 12.14) [51]. Macrocyclic tetraphosphine demonstrated an ability to form square—planar complexes with various nickel salts [52]. 

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